# Patent

## Title
Motion capture element mount

## Abstract

Enables coupling or retrofitting a golf club with active motion capture electronics that are battery powered, passive or active shot count components, for example a passive RFID, and/or a visual marker on the cap for use with visual motion capture cameras. Does not require modifying the golf club. Electronics package and battery can be easily removed and replaced, for example without any tools. May utilize a weight that is removed when inserting the electronic package in the mount, wherein the weight element may have the same weight as an electronics package, for no net change or minimal change in club weight. May be implemented with a shaft enclosure and expander that may be coupled with a screw aligned along an axis parallel to the axis of the golf club shaft. May utilize non-permanently and/or friction coupling between the mount and golf club shaft. Cap may include a visual marker and/or logo.

## Background
This application is a continuation-in-part of U.S. Utility patent application Ser. No. 13/048,850 filed 15 Mar. 2011, which is a continuation-in-part of U.S. Utility patent application Ser. No. 12/901,806 filed 11 Oct. 2010, which is a continuation-in-part of U.S. Utility patent application Ser. No. 12/868,882 filed 26 Aug. 2010, the specifications of which are hereby incorporated herein by reference.


BACKGROUND OF THE INVENTION
1. Field of the Invention
One or more embodiments setting forth the ideas described throughout this disclosure pertain to the field of mounts as utilized in sporting equipment for electronics and visual markers. More particularly, but not by way of limitation, one or more aspects of the disclosure enable a motion capture element mount.
2. Description of the Related Art
Known systems for mounting electronics on sporting equipment include mounts in the shafts of fishing poles, and golf clubs for example. Existing mounts have the following limitations:
Existing mounts for sporting equipment electronics require alteration of an existing piece of sporting equipment before attaching the mount and hence electronics. For example, known mounts require modification of a golf club shaft to include threads.
Some mounts extend longitudinally away from the normal ending point of the shaft for a distance that is far enough to interfere with or provide a confusing point at which to grasp the club.
Other mounts combine the electronics on the mount itself in a monolithic package that does not allow for the weight of the club to remain constant with or without electronics installed. For example, in sports with rules against instrumented sporting equipment, the weight of an instrumented piece of sporting equipment differs from the weight of the same non-instrumented piece of sporting equipment that complies with competition rules.
There are no known systems that include electronics within the shaft of a piece of sporting equipment that are also utilized to provide a visual marker for motion capture. Traditionally, mounts have been used for electronics or visual markers, but not both.
For at least the limitations described above there is a need for a motion capture element mount.
BRIEF SUMMARY OF THE INVENTION
Embodiments of the invention enable a motion capture element mount for a piece of sporting, exercise or medical rehabilitation equipment, for example a golf club, tennis racquet, weight training bar, or any other equipment capable of movement by a human. In addition, embodiments enable existing equipment that was not manufactured originally with a mount for electronics to be retrofitted with a motion capture element mount. The apparatus may be located within a shaft or grip in the handle portion of the equipment for example. The mount is configured to hold electronics and/or a visual marker. Embodiments of the invention do not require modifying the equipment, for example the golf club, to include threads within the shaft. The apparatus may be flush mounted with the normal end of the equipment or have any desired length of extension from the end of the equipment. The mount also allows for the battery to be easily removed and replaced, for example without any tools. Although the remainder of this disclosure refers to an exemplary piece of equipment such as a golf club, one skilled in the art will recognize that embodiments of the invention may be utilized in any type of equipment capable of coupling with the apparatus.
One or more embodiments of the mount include a shaft enclosure and expander that may be coupled with an attachment element, for example a screw that is aligned along an axis parallel to the axis of the golf club shaft. The shaft enclosure and expander are situated within the handle portion of a golf club and engage in inner portion of the golf club shaft or grip for example. In one or more embodiments, the screw is then rotated to move the shaft enclosure and expander together, which thus forces legs of the shaft enclosure in a direction orthogonal to the axis of the golf club shaft. The force of the shaft enclosure against the inner wall of the golf club shaft thus couples the shaft enclosure to the golf club shaft non-permanently, for example based on the coefficient of static friction therebetween. After the shaft enclosure and expander are brought close enough together via the attachment element to securely couple the mount to the golf club shaft or inside portion of a grip that is coupled to the golf club shaft, then either the electronics package or a weight element is coupled with the shaft enclosure. Embodiments of the weight element require no modification of the equipment. A cap is coupled with the shaft enclosure in either case, which provides a cover for the weight element or electronics package and which may include a visual marker and/or logo on the cap. Any other method or structure that enables a non-permanent mount of the apparatus that requires no modification of the golf club shaft is in keeping with the spirit of the invention.
If the electronics package is installed, then generally a positive battery contact, printed circuit board (PCB), an insulator or insulative spacer, with negative electrical contact and battery may be installed between the shaft enclosure and cap. The electronics that may be coupled with the PCB for example may include active motion capture electronics that are battery powered, passive or active shot count components, for example a passive or active radio frequency identification (RFID) tag. Embodiments of the electronics may include motion capture accelerometers and/or gyroscopes and/or an inertial measurement unit along with wireless transmitter/receiver or transceiver components. The RFID tag enables golf shots for each club associated with a golfer to be counted. Golf shots may optionally be counted via an identifier associated with motion capture electronics on the golf club in conjunction with a mobile computer, for example an IPHONE® equipped with an RFID reader that concentrates the processing for golf shot counting on the mobile computer instead of on each golf club. Optionally a wireless antenna may be coupled with the cap or alternatively may be implemented integral to the PCB as desired. One or more embodiments of the invention may also include a Global Positioning System (GPS) antenna. The GPS antenna may be mounted on the printed circuit board or may be located separate from the printed circuit board. One or more embodiments of the invention may also directly or indirectly communicate with any other sensors coupled with the club including motion analysis capture elements, strain gauges or any other type of sensor coupled for example with the golf club head. One or more embodiments of the invention may also utilize a battery coupling that attaches the battery to the shaft enclosure so that when the cap is removed, the battery does not fall out, unless intended. Embodiments may also utilized spring based electrical contacts to prevent loss of electrical conductivity under high acceleration.
As previously stated, one or more embodiments may include a weight element that is interchangeable with the electronic package in the mount. The electronics package may be removed for example to comply with any sporting rules that do not allow instrumented sporting equipment. For example, USGA Rule 14-3 on Artificial Devices prohibits any “unusual device”, for example under 14-3(b) “For the purpose of gauging or measuring distance”. Any embodiment of the electronics package including a GPS receiver may thus be removed prior to match play for example and replaced with a weight element to minimize the weight difference. For example, the weight element may for example weigh close to or the same as the electronics to minimize overall instrumented versus non-instrumented weight differences of the golf club. In addition, a manufacture may provide the mount on each club with a small weight for example, that is removed when the golfer decides to upgrade the club to include active instrumented electronics or passive shot count elements that weigh the same amount. The net effect on the club dynamics for swing then is negligible. In one embodiment, the plastic portion of the mount weighs 5.7 grams and the battery weighs 3 grams while the screw weighs 1.9 grams. Thus the mounting components have minimal weight and by selecting a weight element of the same weight of the electronics package, or elements within the shaft enclosure and cap that are replaced by the weight element, the golfer feels no change in club weight when upgrading to an instrumented club.
The visual marker may be mounted on the cap for use with visual motion capture cameras. A golf club number may also be displayed on in a display area of the cap to indicate which club number is associated with the golf club. Embodiments of the visual marker may be passive or active, meaning that they may either have a visual portion that is visually trackable or may include a light emitting element such as a light emitting diode (LED) that allows for image tracking in low light conditions respectively. This for example may be implemented with a graphical symbol or colored marker at the cap of the mount on the shaft at the end of the handle for example. Motion analysis may be performed externally, for example using a camera and computer system based on the visual marker in any captured images. The visual data may also be utilized in motion analysis in combination with any wireless data from any installed electronics package.



BRIEF DESCRIPTION OF THE DRAWINGS
The above and other aspects, features and advantages of the ideas conveyed through this disclosure will be more apparent from the following more particular description thereof, presented in conjunction with the following drawings wherein:
FIG. 1 illustrates an embodiment of the invention alone in perspective view and as mounted in a golf club shaft as shown in cutaway view.
FIG. 2 illustrates an embodiment of the invention broken into an exploded view of the main components along with the golf club shaft handle and blow up views of the major components in transparent shading.
FIG. 3A illustrates a detailed cutaway view of the main components of an embodiment of the invention.
FIG. 3B illustrates a detailed cutaway view showing the negative battery contact, also shown in full in exploded view in FIG. 4.
FIG. 3C illustrates a detailed cutaway view showing the positive battery contact, also shown in full in exploded view in FIG. 4.
FIG. 4 illustrates an exploded view “A” of the main mount components along with the positive battery contact and battery, while view “B1” shows a top oriented view of the insulator, negative battery contact, electronics package, here a printed circuit board or PCB and cap, while view “B2” shows a bottom oriented view of the same components shown in view “B1”.
FIG. 4A illustrates an exploded view “A” of the main mount components of a second embodiment of the invention along with the positive and negative battery contact and battery, while view “B” shows a bottom oriented view of the insulator, positive and negative battery contact, electronics package, here a printed circuit board or PCB and cap.
FIG. 4B illustrates a perspective view of the shaft enclosure and insulator of a second embodiment of the invention along with the positive and negative battery contact and battery.
FIG. 4C illustrates a perspective view of the insulator along with the positive and negative battery contact and battery.
FIG. 4D illustrates a perspective close-up view of the positive battery contact.
FIG. 4E illustrates a top view of an embodiment of the insulator that is configured to house a battery along with specific exemplary dimensions.
FIG. 4F illustrates a first side of the embodiment of the insulator of FIG. 4E.
FIG. 4G illustrates a second side of the embodiment of the insulator of FIG. 4E.
FIG. 4H illustrates a cross section view “A” of FIG. 4F.
FIG. 4I illustrates a bottom view of the embodiment of the insulator of FIG. 4E.
FIG. 5 illustrates a close up perspective view of the PCB and associated positive and negative contacts that are configured to make an electrical connection with the positive battery contact and the negative battery contact respectively.
FIG. 5A illustrates a second embodiment of the positive battery contact located in the shaft enclosure.
FIG. 6 illustrates a close up perspective view of the cap with PCB and negative battery contact showing along with a coupling element, here four coupling points, and alignment element.
FIG. 6A illustrates a second embodiment of the negative batter contact having faceted surfaces as shown from the bottom side of the insulator.
FIG. 6B illustrates the embodiment of FIG. 6A as shown from the top side of the insulator.
FIG. 7 illustrates a close up perspective view of the cap and alignment element.
FIG. 8 illustrates a cutaway view of a second embodiment of the electronics package in longitudinal form along with a second embodiment of a coupling element.
FIG. 9 illustrates an embodiment of a wireless antenna, for example a BLUETOOTH® antenna, configured to mount within the cap.
FIG. 9A illustrates an embodiment of the cap having two antennas, a wireless antenna, for example a BLUETOOTH® antenna and a GPS antenna.



DETAILED DESCRIPTION OF THE INVENTION
A motion capture element mount will now be described. In the following exemplary description numerous specific details are set forth in order to provide a more thorough understanding of the ideas described throughout this specification. It will be apparent, however, to an artisan of ordinary skill that embodiments of ideas described herein may be practiced without incorporating all aspects of the specific details described herein. In other instances, specific aspects well known to those of ordinary skill in the art have not been described in detail so as not to obscure the disclosure. Readers should note that although examples of the innovative concepts are set forth throughout this disclosure, the claims, and the full scope of any equivalents, are what define the invention. Although this disclosure refers to an exemplary piece of equipment such as a golf club, one skilled in the art will recognize that embodiments of the invention may be utilized in any equipment capable of coupling with the apparatus. This includes any piece of sporting, exercise or medical rehabilitation equipment, for example a golf club, tennis racquet, weight training bar, or any other equipment capable of movement by a human.
FIG. 1 illustrates an embodiment of the invention 100 alone in perspective view and as mounted in a shaft of a piece of movement equipment, here golf club shaft 110 as shown in cutaway view. Embodiments enable a mount for a new golf club or that can be retrofitted in an existing golf club. The mount may be located in the handle portion of the shaft of the golf club, or for example within a grip that is to be attached to the golf club shaft, and is configured to hold electronics and/or a visual marker.
FIG. 2 illustrates an embodiment of the invention broken into an exploded view of the main components along with the golf club shaft handle and blow up views of the major components in transparent shading. One or more embodiments of the mount include shaft enclosure 220 and expander 210 that may be coupled with an attachment mechanism, for example a screw aligned along an axis parallel to the axis of the golf club shaft. The shaft enclosure and expander are situated within the handle portion of a golf club, i.e., golf club shaft 110. In one or more embodiments, the screw is then rotated to move the shaft enclosure towards the expander, which thus forces legs of the shaft enclosure in a direction orthogonal to the axis of the golf club shaft. The force of the shaft enclosure against the inner wall of the golf club shaft thus couples the shaft enclosure to the golf club shaft based on the coefficient of static friction therebetween. Any other mechanism of coupling the shaft enclosure to a golf club in a non-permanent manner is in keeping with the spirit of the invention. After the shaft enclosure and expander are brought close enough together via the screw to securely couple the mount to the golf club shaft, then either the electronics package or a weight element that may for example weigh the same as the electronics, is coupled with the shaft enclosure. Cap 230 is coupled with the shaft enclosure in either case, which provides a cover for the weight element or electronics package and which may include a visual marker and/or logo on the cap. One or more embodiments of the electronics package are removable to comply with any sporting rules that do not allow instrumented sporting equipment for example. Any other method or structure that enables a non-permanent mount of the apparatus that requires no modification of the golf club shaft is in keeping with the spirit of the invention.
Optionally, an identification element or ID sticker, for example an RFID tag may be mounted within the shaft enclosure, cap, or any other portion of the apparatus, for shot count or club identification functionality. The identification element may also be implemented integral to, or coupled with the PCB in any manner as desired.
If the electronics package is installed, then generally a positive battery contact, printed circuit board or PCB, an insulator or insulative spacer, with negative electrical contact and battery may be installed between the shaft enclosure and cap. Optionally, a wireless antenna and/or GPS antenna may be coupled with the cap or alternatively may be implemented integral to the PCB as desired. Also see FIGS. 3A-C, 4, 4A-D and 9 for more detailed views.
FIG. 3A illustrates a detailed cutaway view of the main components of an embodiment of the invention, specifically expander 210, shaft enclosure 220 and cap 230. FIG. 3B illustrates a detailed cutaway view showing negative battery contact 450, also shown in full in exploded view in FIG. 4. FIG. 3C illustrates a detailed cutaway view showing positive battery contact 420, also shown in full in exploded view in FIG. 4. Optional O-ring indentation 310 on shaft enclosure 220 provides a potential well for O-ring 320 to be located. Different size O-rings may be utilized to provide a secure fit on the end of shaft enclosure 220 on the end near cap 230.
FIG. 4 illustrates an exploded view “A” of the main mount components, namely expander 210, shaft enclosure 220 along with screw 410, positive battery contact 420 and battery 430, while view “B1” shows a top oriented view of the insulator 440, negative battery contact 450, electronics package 460, here a printed circuit board or PCB and cap 230, while view “B2” shows a bottom oriented view of the same components shown in view “B1”. The left portion of shaft enclosure 220 shows extensions or “legs” that allow for the shaft enclosure to radially expand when expander 210 is pulled along the axis shown by screw 410, when screw 410 is rotated. To keep expander 210 from simply rotating when screw 410 is rotated, expander 210 may include a protrusion (shown on the left side of the expander) that aligns in a slot formed by two of the shaft enclosure's legs. In this manner, expander 210 is pulled along the axis of the screw without rotating along that axis. Electronics package 460 for example may include active motion capture electronics that are battery powered, passive or active shot count components, for example a passive or active RFID tag, which for example may be coupled with electronics package 460 or for example coupled with insulator 440. In addition, a GPS antenna may also be coupled with electronics package 460 or cap 230 (see FIG. 9A). Embodiments of the electronics may include motion capture accelerometers and/or gyroscopes and/or an inertial measurement unit along with wireless transmitter/receiver or transceiver components. The RFID tag enables golf shots for each club associated with a golfer to be counted. The RFID tag may be coupled with any component shown as RFID tags are tiny, for example cap 230 or shaft enclosure 220 or electronics package 460, or any other element. Golf shots may optionally be counted via an identifier associated with motion capture electronics on the golf club in conjunction with a mobile computer, for example an IPHONE® equipped with an RFID reader that concentrates the processing for golf shot counting on the mobile computer instead of on each golf club.
The visual marker may be mounted on cap 230, shown as a circle with dots in view B1 may be utilized with visual motion capture cameras. A golf club number may also be displayed on in a display area of the cap to indicate which club number is associated with the golf club, which is shown as a small circle with a number in it in view B1. Embodiments of the visual marker may be passive or active, meaning that they may either have a visual portion that is visually trackable or may include a light emitting element such as a light emitting diode (LED) that allows for image tracking in low light conditions respectively. This for example may be implemented with a graphical symbol or colored marker at the cap of the mount on the shaft at the end of the handle for example. Motion analysis may be performed externally, for example using a camera and computer system based on the visual marker in any captured images. The visual data may also be utilized in motion analysis in combination with any wireless data from electronics package 460.
FIG. 4A illustrates an exploded view “A” of the main mount components of a second embodiment of the invention, namely expander 210a, with ribs slightly offset with respect to expander 210 of FIG. 4. In addition, FIG. 4A also shows a second embodiment of shaft enclosure 220a having coupling elements that enable second embodiment of insulator 440a to securely couple to shaft enclosure 220a without falling out if the mount is turned upside down for example. In this embodiment, insulator 440a holds battery 430 inside while providing access to the battery so that positive battery contact 420a and negative battery contact 450a can make electrical contact with battery 430. View “B” shows a bottom-oriented view of the insulator, positive and negative battery contact, electronics package, here a printed circuit board or PCB and cap. Weight element 490 can be any shape so long as weight element 490 fits within, or couples in any direct or indirect manner with shaft enclosure 220 or 220a and cap 230 for example. Weight element 490 can be made to weigh as near as desired to the weight of the components that it replaces, for example to comply with any sporting rules that do not allow instrumented sporting equipment, e.g., during competition. Weight element 490 can also be utilized with the embodiment shown in FIG. 4 as one skilled in the art will appreciate.
FIG. 4B illustrates a perspective view of shaft enclosure 220a and insulator 440a of the second embodiment of the invention of FIG. 4A along with the positive and negative battery contact 420a and 450a respectively (situated above holes in insulator 440a) along with battery 430 that is internally held within insulator 440a. Insulator 440a includes for example snap components, e.g., coupling elements 441 that couple with coupling elements 221 of shaft enclosure 220a so that insulator 440a and hence battery 430 do not fall out when the cap is removed. To remove insulator 440a and hence battery 430, tab 442 may be engaged with for example a finger, screw driver or other implement to disengage coupling elements 441 from coupling elements 221. Alignment component 443 enables rotational alignment of the insulator with the shaft enclosure.
FIG. 4C illustrates a perspective view of the insulator along with the positive and negative battery contact 420a and 450a respectively, and battery 430. Coupling elements 441 are shown on the top and bottom in the written page, however any type of coupling element may be utilized in keeping with the spirit of the invention as desired.
FIG. 4D illustrates a perspective close-up view of positive battery contact 420a. In one or more embodiments of the invention, the positive and negative battery contacts may utilize the same structure. Any type of positive and negative battery contacts may be utilized so long as they maintain electric connection between the battery and electronics package.
FIG. 4E illustrates a top view of an embodiment of insulator 440a that is configured to house a battery along with specific exemplary dimensions. To remove insulator 440a and hence the battery within insulator 440a, tab 442 may be engaged with for example a finger, screw driver or other implement to disengage coupling elements 441 from the coupling elements shown for example in FIG. 4B. In this figure, the numbers represent millimeters, and angle tolerances are within 2 degrees. As shown, this embodiment of insulator 440a is configured to house a 6.4 mm battery. Although not required for distribution in some countries, one or more embodiments of insulator 440a may be constructed to be compliant with EU Directive 2002/95/EC (RoHS) and EU Directive 2002/96/EC (WEEE). Embodiments may alternatively be constructed to be compliant with any other electrical or manufacturing standards as desired.
FIG. 4F illustrates a first side of the embodiment of the insulator of FIG. 4E. See also FIG. 4H for the cross section view. FIG. 4G illustrates a second side of the embodiment of the insulator of FIG. 4E. FIG. 4H illustrates a cross section view “A” of FIG. 4F. FIG. 4I illustrates a bottom view of the embodiment of the insulator of FIG. 4E.
FIG. 5 illustrates a close up perspective view of the electronics package 460 or PCB and associated positive contact 510 and negative contact 520 that are configured to make an electrical connection with the positive battery contact 420 and the negative battery contact 450 respectively. See also FIG. 4 for an exploded view of the relative positioning of the components shown in this figure.
FIG. 5A illustrates a second embodiment of positive battery contact 420b located in the shaft enclosure. This embodiment is symmetrical in that there are two opposing sets of upward projections from the base plane that contacts shaft enclosure 220. One of the opposing sets of upward projections of positive battery contact 420b are slightly wider and are positioned within areas on shaft enclosure 220 to allow for radially aligning positive battery contact 420b with respect to shaft enclosure 220.
FIG. 6 illustrates a close up perspective view of cap 230 with electronics package 460 or PCB and negative battery contact 450 coupled with insulator 440 showing along with a coupling element, here four coupling points 610 (with only the top two shown with reference number 610 with the inside portions visible, while the opposing two have only the initial slot openings in the cap visible), and alignment element 620.
FIG. 6A illustrates a second embodiment of the negative battery contact 450b having faceted surfaces as shown from the bottom side of insulator 440. FIG. 6B illustrates the embodiment of FIG. 6A as shown from the top side of the insulator. The right portion of negative battery contact 450b as shown may be folded over to engage insulator 440 while the opposing end of negative battery contact 450b may freely travel in a slot provided in insulator 440. The slot allows for the negative battery contact 450b to flatten, and hence travel in the slot, based on the force generated by placing the battery against negative battery contact 450b. 
FIG. 7 illustrates a close up perspective view of the cap and alignment element. Alignment element 620 allows for the angular alignment of insulator 440, and electronics package 460 that have indents on their sides to engage the alignment element 620. (See FIG. 4). By aligning insulator 440 and electronics package 460 with cap 230, positive battery contact 420 and negative electrical contact 450 are also aligned rotationally since they couple to respective components non-rotationally, for example.
FIG. 8 illustrates a cutaway view of a second embodiment of electronics package 460a in longitudinal form along with a second embodiment of a coupling element. Any other orientation of electronics is in keeping with the spirit of the invention so long as the mount is configured to hold the desired electronics package. Embodiments of the invention do not require modifying the golf club, for example to include threads within the shaft. Embodiments of the invention also can be flush mounted with the normal end of a golf club shaft or have any desired low profile extension from a non-instrumented club. Embodiments of the invention generally utilize a mount that is separate from the electronics so that the electronics package can be easily removed and replaced, or so that the battery can be easily removed and replaced, for example without any tools. As shown in this embodiment, a different coupling mechanism is used versus coupling points 610, namely threads 810 that engage shaft enclosure 220, which in this embodiment has corresponding threads.
FIG. 9 illustrates an embodiment of wireless antenna 910, configured to mount within cap 230 as shown in the right portion of the figure. Alternatively, the wireless antenna may be coupled with the electronics package 460 or may include any conductive element in any shape that can radiate electromagnetic energy.
FIG. 9A illustrates an embodiment of the cap having two antennas, a wireless antenna, for example a BLUETOOTH® antenna and a GPS antenna 920. The GPS antenna is optional and may be mounted in cap 230 as wireless antenna 910 is, or may be implemented in a different form factor or coupled with the PCB in any direct or indirect manner as one skilled in the art will appreciate.
While the ideas herein disclosed has been described by means of specific embodiments and applications thereof, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope of the invention set forth in the claims.

## Claims

1. A motion capture element mount comprising:
an expander;
a shaft enclosure configured to couple with said expander, wherein said shaft enclosure and said expander are configured to be situated within a piece of equipment;
an attachment element configured to couple said expander with said shaft enclosure and non-permanently engage an inner portion of said piece of equipment without modification of said piece of equipment;
a cap;
wherein said shaft enclosure is configured to non-permanently couple with said cap;

electrical components comprising at least an accelerometer or gyroscope or both;
wherein said electrical components are couple with said shaft enclosure and between said shaft enclosure and said cap, and,
wherein said electrical components further comprise
a positive battery contact,
an insulator that is electrically insulative,
a negative battery contact
an electronics package, and
a wireless antenna;
wherein said shaft enclosure comprises a first set of coupling elements and said insulator comprises a second set of coupling elements, such that said insulator couples with said shaft enclosure via said first set of coupling elements and said second set of coupling elements;



an alignment configured to
rotationally align said insulator or with said shaft enclosure, and
angularly align said insulator and said electronics package with said cap;

a weight element; and
wherein said shaft enclosure and said cap are further configured to internally hold said weight element when at least one of said electrical components is removed,
wherein said weight element comprises a shape such that said weight element fits within said shaft enclosure and said cap,
wherein said cap covers said weight element, and,
wherein said weight element is substantially equal in weight to said at least one of said electrical components to minimize a difference in weight between said at least one of said electrical components that is removed and said weight element to keep a total weight of said motion capture element mount of equal value before said at least one of said electrical components is removed and after said at least one of said electrical components is removed and replaced by said weight element.

2. The apparatus claim 1 wherein said electrical components are removable to comply with sporting regulations.

3. The apparatus claim 1 wherein said piece of equipment is a piece of sporting, exercise or medical rehabilitation equipment, or a golf club, tennis racquet, or weight training bar.

4. The apparatus claim 1 further comprising:
an identifier coupled with said electronics package associated with a golf club number.

5. The apparatus claim 1 further comprising:
an identifier coupled with said electronics package associated with a golf club number wherein said identifier is passive and is configured to operate without contact with a battery or wherein said identifier is active and is configured to couple with a battery.

6. The apparatus claim 1 further comprising at least one passive or active visual marker coupled to said cap and comprises a plurality of positionally offset visual elements;
wherein plurality of positionally offset visual elements are arranged in a non-linear pattern.
wherein said at least one passive or visual marker further comprises a plurality of non-overlapping areas, wherein the plurality of non-overlapping areas enable visual determination of a rotational orientation of the at least one passive or active marker from a point orthogonal to a plane that passes through the plurality of non-overlapping areas; and,
wherein said at least one passive or active visual marker comprising said plurality of positionally offset visual elements further comprises
at least one marker portion that is visually trackable, or
at least one light emitting diode configured to track images in low light conditions.

7. The apparatus of claim 6 wherein said plurality of non-overlapping areas comprise a plurality of positionally offset dots, and wherein said plurality of positionally offset dots arranged in a non-linear pattern.

8. The apparatus claim 1 further comprising:
a display area coupled with said cap and configured to display a golf club number associated with said piece of equipment.

9. The apparatus claim 1 wherein said cap and said shaft enclosure are configured to couple together with a plurality of coupling elements situated around said cap.

10. A motion capture element mount comprising:
an expander;
a shaft enclosure configured to couple with said expander, wherein said shaft enclosure and said expander are configured situated within a piece of equipment;
an attachment element configured to couple said expander with said shaft enclosure and non-permanently engage an inner portion of a golf club shaft or grip of a golf club without modification of said piece of equipment;
a cap;
electrical components comprising
at least an accelerometer or gyroscope or both;
a positive battery contact;
an insulator that is electrically insulative;
a negative battery contact; and,
an electronics package; and,

wherein said electrical components are coupled said shaft enclosure and between said shaft enclosure and said cap;
wherein said shaft enclosure comprises a first set of coupling elements and said insulator comprises a second set of coupling elements, such that said insulator couples with said shaft enclosure via said first set of coupling elements and said second set of coupling elements;
wherein said shaft enclosure and said cap are configured to internally hold said positive battery contact, said insulator, said negative battery contact and said electronics package;
an alignment element configured to
rotationally align said insulator with said shaft enclosure, and
angularly align said insulator and said electronics package with said cap; and,

a weight element;
wherein said shaft enclosure and said cap are further configured to internally hold said weight element when at least one of said electrical components is removed,
wherein said weight element comprises a shape such that sail weight element fits within said shaft enclosure and said cap,
wherein said cap covers said weight element, and,
wherein said weight element is substantially equal in weight to said at least one of said electrical components to minimize a difference in weight between said at least one of said electrical components that is removed and said weight element to keep a total weight of said motion capture element mount of equal value before said at least one of said electrical components is removed and after said at least one of said electrical components is removed and replaced by said weight element.

11. The apparatus claim 10 wherein said electrical components are removable to comply with sporting regulations.

12. The apparatus claim 10 further comprising:
a wireless antenna coupled with said cap and coupled with said electronics package.

13. The apparatus claim 10 further comprising:
an identifier coupled with said electronics package associated with a golf club number.

14. The apparatus claim 10 further comprising:
an identifier coupled with said electronics package associated with a golf club number wherein said identifier is active and is configured to couple with a battery or is passive and is configured to operate without contact with a battery.

15. The apparatus claim 10 further comprising at least one passive or active visual marker coupled to said cap and comprises a plurality of positionally offset visual elements;
wherein said plurality of positionally offset visual elements are arranged in a non-linear pattern;
wherein said at least one passive or visual marker further comprises a plurality of non-overlapping areas, wherein the plurality of non-overlapping areas enable visual determination of a rotational orientation of the at least one passive or active marker from a point orthogonal to a plane that passes through the plurality of non-overlapping areas; and
wherein said at least one passive or active visual marker comprising said plurality of positionally offset visual elements further comprises
at least one marker portion that is visually trackable, or
at least one light emitting diode configured to track images in low light conditions.

16. The apparatus claim 10 wherein said cap and said shaft enclosure are configured to couple together with a plurality of coupling elements situated around said cap.

17. The apparatus claim 10 further comprising:
a display area coupled with said cap and configured to display a golf club number associated with said piece of equipment.

18. The apparatus of claim 15 wherein said plurality of non-overlapping areas comprise a plurality of positionally offset dots, and wherein said plurality of positionally offset dots are arranged in a non-linear pattern.

19. A motion capture element mount comprising:
an expander;
a shaft enclosure configured to couple with said expander, wherein said shaft enclosure and said expander are configured to be situated a pee of equipment;
an attachment element configured to couple said expander with said shaft enclosure and non-permanently engage an inner portion of a golf club shaft or grip of a golf club without modification of said piece of equipment;
a cap;
at least one passive or active visual marker coupled to said cap and comprises a plurality of positionally offset visual elements;
wherein said at least one passive or visual marker further comprises a plurality of non-overlapping areas with a plurality of positionally offset dots, wherein said plurality of positionally offset visual elements are arranged in a non-linear pattern, and wherein the plurality of non-overlapping areas enable visual determination of a rotational orientation of the at least one passive or active marker from a point orthogonal to a plane that passes through the plurality of non-overlapping areas;

electrical components comprising
at least an accelerometer or gyroscope or both;
a positive battery contact;
an insulator that is electrically insulative;
a negative battery contact;
an electronics package; and,
an identifier;
wherein said electrical components are coupled with said shaft enclosure and arranged between said shaft enclosure and said cap; and,
wherein said shaft enclosure comprises a first set of coupling elements and said insulator comprises a second set of counting elements, such that said insulator couples with said shaft enclosure via said first set of coupling elements and said second set of coupling elements;


an alignment element configured to
rotationally align said insulator with said shaft enclosure, and
angularly align said insulator and said electronics package said cap;

a wireless antenna;
a visual marker coupled with said cap;
a display area coupled with said cap and configured to display a golf club number associated with said piece of equipment;
a weight element;
wherein said shaft enclosure and said cap are further configured to internally hold said weight element when at least one of said electrical components is removed,
wherein said weight element comprises a shape such that said weight element fits within said shaft enclosure and said cap,
wherein said cap covers said weight element,
wherein said weight element is substantially equal in weight to said at least one of said electrical components to minimize a difference in weight between said at least one of said at least one of said electrical components that is removed and said weight element to keep a total weight of said motion capture element mount of equal value before said at least one of said electrical components is removed and after said at least one of said electrical components is removed and replaced by said weight element; and,

wherein said shaft enclosure and said cap are configured to internally hold said positive battery contact, said insulator, said negative battery contact, said electronics package, said identifier and said wireless antenna and wherein said electrical components are removable from within said shaft enclosure and said cap to comply with sporting regulations.